The integration test runs the counter through the real browser path in
happy-dom: start(), store events, raf-batched morph, DOM click handlers,
emit coalescing. examples/counter is the Phase 2 exit criterion: one app
module mounted zero-build in a browser via import map and string-rendered
by node examples/counter/render.js.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014NgfSjHE11oFpoSnLVKLXd
